"I was a compulsive, serial masturbator," Robert Downey Jr. confessed, adding, "I utilized that organ and rode it for everything it was worth."

He's not the only A-List oversharer.

"I'm kind of unstoppable right now," Jessica Simpson once told Ryan Seacrest about her, um, very active sex life during pregnancy. "The Big O is, like, the biggest O ever."

O. My.

Then there's George Clooney, whose first orgasmic moment happened a little something like this: "I believe it was while climbing a rope when I was six or seven years old. I mean, nothing came out, but all the other elements were there. I remember getting to the top of the rope, hanging off the rope, and going, 'Oh, my God, this feels great!'"